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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
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Stability and Electronic Structure of Different Nanophases/Al Interfaces in Al-Cu-Li Alloys: A First-Principles
Yan Liu1, Chuansen Deng1, Chenxu Zhao1
1School of Materials Science and Engineering, Fuzhou University, Qishan Campus, Minhou 350116, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 10, 2025
Summary
This study reveals that Al-Cu-Li alloys
Area of Science:
- Materials Science
- Computational Materials Science
- Physical Metallurgy
Background:
- Mechanical properties of precipitation-strengthened aluminum alloys depend on precipitate interfaces.
- Understanding precipitate stability and electronic structure is key for alloy design.
Purpose of the Study:
- Investigate the stability and electronic structure of interfaces between matrix and nanophases (δ'-Al3Li, θ'-Al2Cu, T1-Al6Cu4Li3) in Al-Cu-Li alloys.
- Provide theoretical insights for optimizing precipitate phases and interface design.
Main Methods:
- First-principles calculations were employed to systematically study interface properties.
- Analyzed formation enthalpy, surface energy, and interface energy.
Main Results:
- T1 phase is the most thermodynamically stable, while δ' precipitates preferentially due to a low nucleation barrier.
- Li-terminal surfaces (δ'(001)-AlLi and T1(001)-AlLi) show high stability.
- Al/δ'/Al interface exhibits optimal bonding strength; Cu-Al bonds enhance Al/θ'/Al and Al/T1/Al interface stability.
- Electronic structure and bonding characteristics dictate interface strength and material properties.
Conclusions:
- The study elucidates the critical role of electronic rearrangement and interfacial bonding in strengthening Al-Li alloys.
- Theoretical insights guide the optimization of precipitate phases and interfaces for enhanced mechanical performance.
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